Tomi Eckert
eeb5b2eb7b
Introduces state management to 'monitor.sh' to send notifications only when a monitored status changes (e.g., from healthy to alert, or alert to resolved). This prevents repetitive alerts for persistent issues. Creates a 'monitor_state' directory for tracking. Updates script version to 1.2.0.
222 lines
9.8 KiB
Bash
222 lines
9.8 KiB
Bash
#!/bin/bash
|
||
# Version: 1.2.0
|
||
# =============================================================================
|
||
# SAP HANA Monitoring Script
|
||
#
|
||
# Checks HANA processes, disk usage, and log segment state.
|
||
# Sends ntfy.sh notifications if thresholds are exceeded.
|
||
# =============================================================================
|
||
|
||
# --- Lock File Implementation ---
|
||
LOCK_FILE="/tmp/hana_monitor.lock"
|
||
if [ -e "$LOCK_FILE" ]; then
|
||
echo "▶️ Script is already running. Exiting."
|
||
exit 1
|
||
fi
|
||
touch "$LOCK_FILE"
|
||
# Ensure lock file is removed on script exit
|
||
trap 'rm -f "$LOCK_FILE"' EXIT
|
||
|
||
# --- Configuration and Setup ---
|
||
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd)"
|
||
CONFIG_FILE="${SCRIPT_DIR}/monitor.conf"
|
||
|
||
if [ ! -f "$CONFIG_FILE" ]; then
|
||
echo "❌ Error: Configuration file not found at ${CONFIG_FILE}" >&2
|
||
rm -f "$LOCK_FILE"
|
||
exit 1
|
||
fi
|
||
source "$CONFIG_FILE"
|
||
|
||
STATE_DIR="${SCRIPT_DIR}/monitor_state"
|
||
mkdir -p "${STATE_DIR}"
|
||
|
||
# Helper functions for state management
|
||
get_state() {
|
||
local key="$1"
|
||
if [ -f "${STATE_DIR}/${key}.state" ]; then
|
||
cat "${STATE_DIR}/${key}.state"
|
||
else
|
||
echo ""
|
||
fi
|
||
}
|
||
|
||
set_state() {
|
||
local key="$1"
|
||
local value="$2"
|
||
echo "$value" > "${STATE_DIR}/${key}.state"
|
||
}
|
||
|
||
HOSTNAME=$(hostname)
|
||
SQL_QUERY="SELECT b.host, b.service_name, a.state, count(*) FROM PUBLIC.M_LOG_SEGMENTS a JOIN PUBLIC.M_SERVICES b ON (a.host = b.host AND a.port = b.port) GROUP BY b.host, b.service_name, a.state;"
|
||
|
||
send_notification_if_changed() {
|
||
local alert_key="$1"
|
||
local title_prefix="$2" # e.g., "HANA Process"
|
||
local current_message="$3"
|
||
local is_alert_condition="$4" # "true" or "false"
|
||
local current_value="$5" # The value to store as state (e.g., "85%", "GREEN", "ALERT")
|
||
|
||
local previous_value=$(get_state "${alert_key}")
|
||
|
||
if [ "$current_value" != "$previous_value" ]; then
|
||
local full_title=""
|
||
local full_message=""
|
||
|
||
if [ "$is_alert_condition" == "true" ]; then
|
||
full_title="${title_prefix} Alert"
|
||
full_message="🚨 Critical: ${current_message}"
|
||
else
|
||
# Check if it was previously an alert (i.e., previous_value was not "OK")
|
||
if [ -n "$previous_value" ] && [ "$previous_value" != "OK" ]; then
|
||
full_title="${title_prefix} Resolved"
|
||
full_message="✅ Resolved: ${current_message}"
|
||
else
|
||
# No alert, and no previous alert to resolve, so just update state silently
|
||
set_state "${alert_key}" "$current_value"
|
||
echo "ℹ️ State for ${alert_key} updated to ${current_value}. No notification sent."
|
||
return
|
||
fi
|
||
fi
|
||
|
||
local final_message="[${COMPANY_NAME} | ${HOSTNAME}] ${full_message}"
|
||
curl -H "Authorization: Bearer ${NTFY_TOKEN}" -H "Title: ${full_title}" -d "${final_message}" "${NTFY_TOPIC_URL}" > /dev/null 2>&1
|
||
set_state "${alert_key}" "$current_value"
|
||
echo "🔔 Notification sent for ${alert_key}: ${full_message}"
|
||
else
|
||
echo "ℹ️ State for ${alert_key} unchanged. No notification sent."
|
||
fi
|
||
}
|
||
|
||
# --- HANA Process Status ---
|
||
echo "⚙️ Checking HANA process status..."
|
||
if [ ! -x "$SAPCONTROL_PATH" ]; then
|
||
echo "❌ Error: sapcontrol not found or not executable at ${SAPCONTROL_PATH}" >&2
|
||
send_notification_if_changed "hana_sapcontrol_path" "HANA Monitor Error" "sapcontrol not found or not executable at ${SAPCONTROL_PATH}" "true" "SAPCONTROL_ERROR"
|
||
exit 1
|
||
fi
|
||
|
||
non_green_processes=$("${SAPCONTROL_PATH}" -nr "${HANA_INSTANCE_NR}" -function GetProcessList | tail -n +6 | grep -v 'GREEN')
|
||
|
||
if [ -n "$non_green_processes" ]; then
|
||
echo "🚨 Alert: One or more HANA processes are not running!" >&2
|
||
echo "$non_green_processes" >&2
|
||
send_notification_if_changed "hana_processes" "HANA Process" "One or more HANA processes are not GREEN. Problem processes: ${non_green_processes}" "true" "PROCESS_ALERT:${non_green_processes}"
|
||
exit 1 # Exit early as other checks might fail
|
||
else
|
||
send_notification_if_changed "hana_processes" "HANA Process" "All HANA processes are GREEN." "false" "OK"
|
||
echo "✅ Success! All HANA processes are GREEN."
|
||
fi
|
||
|
||
# --- Disk Space Monitoring ---
|
||
echo "ℹ️ Checking disk usage..."
|
||
for dir in "${DIRECTORIES_TO_MONITOR[@]}"; do
|
||
if [ ! -d "$dir" ]; then
|
||
echo "⚠️ Warning: Directory '$dir' not found. Skipping." >&2
|
||
send_notification_if_changed "disk_dir_not_found_${dir//\//_}" "HANA Disk Warning" "Directory '$dir' not found." "true" "DIR_NOT_FOUND"
|
||
continue
|
||
fi
|
||
usage=$(df -h "$dir" | awk 'NR==2 {print $5}' | sed 's/%//')
|
||
echo " - ${dir} is at ${usage}%"
|
||
if (( $(echo "$usage > $DISK_USAGE_THRESHOLD" | bc -l) )); then
|
||
echo "🚨 Alert: ${dir} usage is at ${usage}% which is above the ${DISK_USAGE_THRESHOLD}% threshold." >&2
|
||
send_notification_if_changed "disk_usage_${dir//\//_}" "HANA Disk" "Disk usage for ${dir} is at ${usage}%." "true" "${usage}%"
|
||
else
|
||
send_notification_if_changed "disk_usage_${dir//\//_}" "HANA Disk" "Disk usage for ${dir} is at ${usage}% (below threshold)." "false" "OK"
|
||
fi
|
||
done
|
||
|
||
# --- HANA Log Segment Monitoring ---
|
||
echo "⚙️ Executing HANA SQL query..."
|
||
if [ ! -x "$HDBSQL_PATH" ]; then
|
||
echo "❌ Error: hdbsql not found or not executable at ${HDBSQL_PATH}" >&2
|
||
send_notification_if_changed "hana_hdbsql_path" "HANA Monitor Error" "hdbsql not found or not executable at ${HDBSQL_PATH}" "true" "HDBSQL_ERROR"
|
||
exit 1
|
||
fi
|
||
readarray -t sql_output < <("$HDBSQL_PATH" -U "$HANA_USER_KEY" -c ";" "$SQL_QUERY" 2>&1)
|
||
if [ $? -ne 0 ]; then
|
||
echo "❌ Failure! The hdbsql command failed. Please check logs." >&2
|
||
error_message=$(printf '%s\n' "${sql_output[@]}")
|
||
send_notification_if_changed "hana_hdbsql_command" "HANA Monitor Error" "The hdbsql command failed. Details: ${error_message}" "true" "HDBSQL_COMMAND_FAILED"
|
||
exit 1
|
||
fi
|
||
|
||
total_segments=0
|
||
truncated_segments=0
|
||
free_segments=0
|
||
for line in "${sql_output[@]}"; do
|
||
if [[ -z "$line" || "$line" == *"STATE"* ]]; then continue; fi
|
||
cleaned_line=$(echo "$line" | tr -d '"')
|
||
state=$(echo "$cleaned_line" | awk -F',' '{print $3}')
|
||
count=$(echo "$cleaned_line" | awk -F',' '{print $4}')
|
||
total_segments=$((total_segments + count))
|
||
if [[ "$state" == "Truncated" ]]; then
|
||
truncated_segments=$((truncated_segments + count))
|
||
elif [[ "$state" == "Free" ]]; then
|
||
free_segments=$((free_segments + count))
|
||
fi
|
||
done
|
||
|
||
echo "ℹ️ Total Segments: ${total_segments}"
|
||
echo "ℹ️ Truncated Segments: ${truncated_segments}"
|
||
echo "ℹ️ Free Segments: ${free_segments}"
|
||
|
||
if [ $total_segments -eq 0 ]; then
|
||
echo "⚠️ Warning: No log segments found. Skipping percentage checks." >&2
|
||
send_notification_if_changed "hana_log_segments_total" "HANA Log Segment Warning" "No log segments found. Skipping percentage checks." "true" "NO_LOG_SEGMENTS"
|
||
exit 0
|
||
else
|
||
send_notification_if_changed "hana_log_segments_total" "HANA Log Segment" "Log segments found." "false" "OK"
|
||
fi
|
||
|
||
truncated_percentage=$((truncated_segments * 100 / total_segments))
|
||
if (( $(echo "$truncated_percentage > $TRUNCATED_PERCENTAGE_THRESHOLD" | bc -l) )); then
|
||
echo "🚨 Alert: ${truncated_percentage}% of log segments are 'Truncated'." >&2
|
||
send_notification_if_changed "hana_log_truncated" "HANA Log Segment" "${truncated_percentage}% of HANA log segments are in 'Truncated' state." "true" "${truncated_percentage}%"
|
||
else
|
||
send_notification_if_changed "hana_log_truncated" "HANA Log Segment" "${truncated_percentage}% of HANA log segments are in 'Truncated' state (below threshold)." "false" "OK"
|
||
fi
|
||
|
||
free_percentage=$((free_segments * 100 / total_segments))
|
||
if (( $(echo "$free_percentage < $FREE_PERCENTAGE_THRESHOLD" | bc -l) )); then
|
||
echo "🚨 Alert: Only ${free_percentage}% of log segments are 'Free'." >&2
|
||
send_notification_if_changed "hana_log_free" "HANA Log Segment" "Only ${free_percentage}% of HANA log segments are in 'Free' state." "true" "${free_percentage}%"
|
||
else
|
||
send_notification_if_changed "hana_log_free" "HANA Log Segment" "Only ${free_percentage}% of HANA log segments are in 'Free' state (above threshold)." "false" "OK"
|
||
fi
|
||
|
||
echo "ℹ️ Checking last successful data backup status..."
|
||
|
||
# Query to get the start time of the most recent successful complete data backup
|
||
last_backup_date=$("$HDBSQL_PATH" -U "$HANA_USER_KEY" -j -a -x \
|
||
"SELECT TOP 1 SYS_START_TIME FROM M_BACKUP_CATALOG WHERE ENTRY_TYPE_NAME = 'complete data backup' AND STATE_NAME = 'successful' ORDER BY SYS_START_TIME DESC" 2>/dev/null | tr -d "\"" | sed 's/\..*//') # sed removes fractional seconds
|
||
|
||
if [[ -z "$last_backup_date" ]]; then
|
||
# No successful backup found at all
|
||
local message="No successful complete data backup found for ${COMPANY_NAME} HANA."
|
||
echo "🚨 Critical: ${message}"
|
||
send_notification_if_changed "hana_backup_status" "HANA Backup" "${message}" "true" "NO_BACKUP"
|
||
return
|
||
fi
|
||
|
||
# Convert dates to epoch seconds for comparison
|
||
last_backup_epoch=$(date -d "$last_backup_date" +%s)
|
||
current_epoch=$(date +%s)
|
||
threshold_seconds=$((BACKUP_THRESHOLD_HOURS * 3600))
|
||
|
||
age_seconds=$((current_epoch - last_backup_epoch))
|
||
age_hours=$((age_seconds / 3600))
|
||
|
||
if (( age_seconds > threshold_seconds )); then
|
||
local message="Last successful HANA backup for ${COMPANY_NAME} is ${age_hours} hours old, which exceeds the threshold of ${BACKUP_THRESHOLD_HOURS} hours. Last backup was on: ${last_backup_date}."
|
||
echo "🚨 Critical: ${message}"
|
||
send_notification_if_changed "hana_backup_status" "HANA Backup" "${message}" "true" "${age_hours}h"
|
||
else
|
||
local message="Last successful backup is ${age_hours} hours old (Threshold: ${BACKUP_THRESHOLD_HOURS} hours)."
|
||
echo "✅ Success! ${message}"
|
||
send_notification_if_changed "hana_backup_status" "HANA Backup" "${message}" "false" "OK"
|
||
fi
|
||
|
||
echo "✅ Success! HANA monitoring check complete."
|
||
|